In process login flow
Added login flow part
Dealt with conflicts merging master into githubUser. Just minor things.
Updated UserManager with dependency injected contexts and class variable currentUser
Removed code from UserManager that was inappropriate
Merge pull request #17 from flatiron-school/githubUser

First version of login flow
Added user extension for github dictionary conversion to user object
updated User object with optionals for all items except githubID
Added User+GithubConverter extension